I don't think I have learned that yet. Don't have a known time in our measurements so that equation wouldn't work. Am I supposed to use the trajectory equation? But would it would it work in this case since the launcher was launching the projectile from a table onto the floor?

Don't have a known time in our measurements so that equation wouldn't work.

I hadn't told you to use it if it wasn't an equation that helps you solve your problem. Just count the degrees of freedom: How many real-valued parameters are unknown? How many real-valued equations did I give you?